Research on Deep Peak Shaving Performance of 1 000 MW Ultra-Supercritical Coal-Fired Boiler

doi:10.12096/j.2096-4528.pgt.23156

Abstract

Abstract:

Objectives Deep peak regulation of coal-fired boilers is crucial to the stability of the future power system dominated by new energy, but there is a lack of performance and engineering applications on deep peak regulation of 1 000 MW ultra-supercritical coal-fired boilers. In order to improve the deep peak regulation capacity of 1 000 MW coal-fired boilers, a 1 000 MW coal-fired unit of a power plant is selected to carry out a wide-load high-efficiency research. Methods Focusing on the unit load depth peak regulation load of 340 MW, the low-load stable combustion experiment and the denitrification side inlet flue gas test were carried out. In addition, the main operating parameters of the boiler, the temperature distribution of the furnace and the combustion adjustment test on the boiler side were analyzed. The combustion optimization adjustment experiment was carried out on this basis. Results 1 000 MW unit has a deep peak regulation capacity of 34% rated power. The flue gas temperatures of selective catalytic reduction (SCR) denitrification inlet are basically 320-350 ℃, which meet the flue gas temperature requirements higher than 300 ℃. After the optimization and adjustment of the boiler, the modified thermal efficiency of the boiler is 94.09% (increased by 0.94%), and the coal consumption for power supply is reduced by 3.27 g/(kW⋅h). The NO _x at the inlet of SCR denitrification is basically 180-260 mg/m³ (decreased by about 30 mg/m³), and meet the requirements of less than 300 mg/m³. Conclusions The research results are helpful to improve the safety, economy and environmental properties of low-load operation of 1 000 MW coal-fired thermal power units.

Key words: coal-fired power generation, coal-fired boiler, deep peak regualtion, low load, stable combustion experiment, combustion optimization adjust, ultra-supercritical unit

CLC Number:

TK 227.2

Yong DING. Research on Deep Peak Shaving Performance of 1 000 MW Ultra-Supercritical Coal-Fired Boiler[J]. Power Generation Technology, 2024, 45(3): 382-391.

Figures/Tables 9

References 33

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参数	BMCR	BRL	THA
过热蒸汽流量/(t/h)	3 035.0	3 007.5	2 922.8
过热器出口压力/MPa	29.30	29.28	28.82
过热器出口温度/℃	605	605	605
再热蒸汽流量/(t/h)	2 367.2	2 331.6	2 263.6
再热器进口压力/MPa	5.64	5.55	5.40
再热器出口压力/MPa	5.45	5.36	5.21
再热器出口温度/℃	623	623	623
省煤器进口给水温度/℃	313	313	313
实际燃烧消耗量/(t/h)	370.3	366.7	366.3
排烟温度/℃	163	163	163
设计锅炉热效率/%	95.23	95.19	95.16

参数	BMCR	BRL	THA
过热蒸汽流量/(t/h)	3 035.0	3 007.5	2 922.8
过热器出口压力/MPa	29.30	29.28	28.82
过热器出口温度/℃	605	605	605
再热蒸汽流量/(t/h)	2 367.2	2 331.6	2 263.6
再热器进口压力/MPa	5.64	5.55	5.40
再热器出口压力/MPa	5.45	5.36	5.21
再热器出口温度/℃	623	623	623
省煤器进口给水温度/℃	313	313	313
实际燃烧消耗量/(t/h)	370.3	366.7	366.3
排烟温度/℃	163	163	163
设计锅炉热效率/%	95.23	95.19	95.16

参数		设计煤种	校核煤种
元素分析	收到基碳质量分数C_ar/%	59.32	52.76
	收到基氢质量分数H_ar/%	3.35	3.40
	收到基氧质量分数O_ar/%	9.05	9.35
	收到基氮质量分数N_ar/%	0.71	0.73
	收到基硫质量分数S_ar/%	0.75	0.57
工业分析	收到基灰分质量分数A_ar/%	10.82	21.29
	收到基水分质量分数M_t/%	16.00	11.90
	空气干燥基水分质量分数M_ad/%	8.61	5.42
	干燥无灰基挥发分质量分数V_daf/%	33.76	36.08
发热量	低位发热量Q_net，ar/(kJ/kg)	22 190	19 740

参数		设计煤种	校核煤种
元素分析	收到基碳质量分数C_ar/%	59.32	52.76
	收到基氢质量分数H_ar/%	3.35	3.40
	收到基氧质量分数O_ar/%	9.05	9.35
	收到基氮质量分数N_ar/%	0.71	0.73
	收到基硫质量分数S_ar/%	0.75	0.57
工业分析	收到基灰分质量分数A_ar/%	10.82	21.29
	收到基水分质量分数M_t/%	16.00	11.90
	空气干燥基水分质量分数M_ad/%	8.61	5.42
	干燥无灰基挥发分质量分数V_daf/%	33.76	36.08
发热量	低位发热量Q_net，ar/(kJ/kg)	22 190	19 740

工况	工况说明	燃煤煤质特性
T-01	340 MW下机组低负荷稳燃试验(不投用等离子)	全水分质量分数为15.80%，收到基灰分质量分数为16.23%，干燥无灰基挥发分质量分数为36.21%，收到基全硫质量分数为0.36%，收到基低位发热量为20 461 kJ/kg
T-02	340 MW下锅炉运行优化及性能试验(变运行氧体积分数为7.0%)
T-03	340 MW下锅炉运行优化及性能试验(变运行氧体积分数为6.3%)
T-04	340 MW下锅炉运行优化及性能试验(变B+C+E磨组合运行方式)